Inorganic Janus Nanosheets

Liang, Fuxin; Shen, Ke; Qu, Xiaozhong; Zhang, Chengliang; Wang, Qian; Li, Jiaoli; Liu, Jiguang; Yang, Zhenzhong

doi:10.1002/anie.201007519

Cited by 237 publications

(189 citation statements)

References 32 publications

(19 reference statements)

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“…[6][7][8][9][10][11][12] Since the late 1980s researchers aim at exploiting the remarkable properties of dissymmetrical particles and, by extension, of particles exhibiting partial segregation between two components. 9, 13-18 Nanophase segregation of bi-component organic shells, or self-assembled monolayers (SAMs), on nanoparticles is a straightforward way to reach such asymmetric nano-objects.…”

Section: Introductionmentioning

confidence: 99%

Nanophase Segregation of Self-Assembled Monolayers on Gold Nanoparticles

et al. 2017

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Nanophase segregation of a bi-component thiol self-assembled monolayer is predicted using atomistic molecular dynamics simulations and experimentally confirmed. The simulations suggest the formation of domains rich in acid-terminated chains, on one hand, and of domains rich in amide-functionalized ethylene glycol oligomers, on the other hand. In particular, within the amide-ethylene glycol oligomers region, a key role is played by the formation of inter-chain hydrogen bonds. The predicted phase segregation is experimentally confirmed by the synthesis of 35 and 15 nm gold nanoparticles functionalized with several binary mixtures of ligands. An extensive study by transmission electron microscopy and electron tomography using silica selective heterogeneous nucleation on acid-rich domains to provide electron contrast supports simulations and highlights patchy nanoparticles with a trend towards Janus nano-objects depending on the nature of the ligands and the particle size. These results validate our computational platform as an effective tool to predict nanophase separation in organic mixtures on a surface and drive further exploration of advanced nanoparticle functionalization.

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Section: Introductionmentioning

confidence: 99%

Nanophase Segregation of Self-Assembled Monolayers on Gold Nanoparticles

et al. 2017

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“…At this pH, it is rational that the acid group terminated sides are stacked inwardly face-to-face with the protonated amine group exposed to the aqueous phase. We expected that a bilayered structure would form among the Janus nanosheets [8]. Surprisingly, individual nanosheets were self-folded into a wrinkled structure.…”

Section: Science China Materialsmentioning

confidence: 98%

“…Janus nanosheets are particularly interesting because of their highly anisotropic shape besides their asymmetric chemistry. As the rotation of Janus nanosheets at an interface is restricted, the nanosheets appear to form mosaics on the interface that can better stabilize emulsions [7,8]. It would thus be useful to develop methods to synthesize Janus nanosheets with tunable thickness and composition.…”

Section: Introductionmentioning

confidence: 99%

“…It was, however, necessary to properly modify the platelets to form Pickering emulsions. Recently, we proposed a simple way to fabricate silica Janus nanosheets by crushing the corresponding Janus hollow spheres [8]. The Janus hollow spheres were prepared by materialization of the temporal Janus emulsion interface via a self-organized sol-gel process [14].…”

Section: Introductionmentioning

confidence: 99%

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Amine/acid composite Janus nanosheets

Wang

Liang

et al. 2015

Sci. China Mater.

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Janus materials have witnessed fast development due to their diversified promising performances and practical applications. Compared with their spherical counterparts, Janus nanosheets have gained more concerns for their highly anisotropic shape besides chemistry. Herein, 3.5 nm ultrathin and flexible Janus nanosheets with carboxyl group terminated onto one side are fabricated by surface sol-gel process of the self-assembled monolayer of an amphiphilic silane onto the template CaCO3 particle firstly. Amine/acid composite Janus nanosheets are further derived from these carboxyl group terminated silica Janus nanosheets by selective conjugation with amine groups onto the other side. The amine/acid composite Janus nanosheets are dually pH responsive, and well dispersible in aqueous solution at both low and high pH levels. The nanosheets are aggregated forming multi-layered face-to-back superstructures at intermediate pH levels. This is originated by the opposite electrostatic interaction between the carboxyl and the amine groups. This approach can be extended to other silanes, and a huge family of Janus nanosheets is expected with tunable composition and performance.

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“…In 2011, we developed a facile approach for large-scale production of inorganic Janus sheets by applying the crushing strategy [37]. First, silica Janus hollow spheres with hydrophilic surface on the outside and hydrophobic surface on the inside were fabricated by the self-assembled sol-gel process at an emulsion interface.…”

Section: Janus Sheets/disksmentioning

confidence: 99%